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Texas Instruments SN74ABT861DW
- Part No.:
- SN74ABT861DW
- Manufacturer:
- Texas Instruments
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74ABT861DW.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:400
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Product details
Overview
SN74ABT861 from Texas Instruments is a 10-bit noninverting bus transceiver with 3-state outputs, designed for asynchronous bidirectional data transfer between A and B buses in industrial and embedded systems. It operates from 4.5 V to 5.5 V, supports –32 mA high-level and 64 mA low-level output drive, features power-up/power-down high-impedance protection, and is qualified for –40°C to 85°C operation in SOIC (DW) package.
For engineers reviewing the SN74ABT861 datasheet, SN74ABT861 pinout, SN74ABT861 application, or SN74ABT861 equivalent, this page delivers verified electrical specs, functional timing behavior, real-world bus isolation use cases, and validated alternative transceivers for legacy TTL-compatible system upgrades.
Technical Context
The SN74ABT861 implements dual independent 3-state enable logic (OEAB and OEBA) to control directionality: OEAB low enables A→B transmission, OEBA low enables B→A transmission, both high isolates buses, both low latches bidirectional data. Its EPIC-IIB BiCMOS process delivers TTL-compatible input thresholds (VIL = 0.8 V, VVIH = 2.0 V) while reducing static power versus standard ABT families.
Propagation delays are tightly specified: tPLH/tPHL ≤ 5.3 ns (max) at VCC = 5 V, CL = 50 pF; enable/disable times (tPZH, tPZL, tPHZ, tPLZ) range from 1 ns to 7.5 ns. Input clamp current exceeds –18 mA, and latch-up immunity exceeds 500 mA per JESD-17.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures compatibility with 5-V TTL and CMOS logic rails without level-shifting. |
| IOHL/IOL | –32 mA / 64 mA - Drives heavy capacitive loads (e.g., backplane traces or multiple inputs) without signal degradation. |
| tPLH/tPHL | ≤ 5.3 ns (max) - Enables reliable operation in high-speed address/data multiplexing up to ~100 MHz system clocks. |
| Input Thresholds | VIL = 0.8 V, VIH = 2.0 V - Guarantees noise margin > 0.4 V under worst-case VCC = 4.5 V conditions. |
| Power-Up State | High-Z when VCC < 2.1 V - Prevents bus contention during supply ramp-up or brownout recovery. |
| ESD Rating | > 2000 V HBM, > 200 V MM - Meets MIL-STD-883 requirements for rugged industrial handling and board assembly. |
| θJA | 81°C/W (DW package) - Supports continuous operation at full drive in ambient temperatures up to 70°C with minimal heatsinking. |
Pinout & Package
SN74ABT861 is packaged in a 24-pin SOIC (DW) with 300-mil body width and standard JEDEC MS-013 footprint. Pin 1 is marked by a beveled corner or notch; pins are numbered counter-clockwise from top-left.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 13 | OEBA, OEAB | Active-low bus direction controls: OEBA enables B→A, OEAB enables A→B; both high isolate, both low latch. |
| 2–11, 14–23 | A1–A10, B1–B10 | 10-bit bidirectional I/O ports - A-side and B-side connect to separate buses; no internal inversion. |
| 12 | GND | Ground reference for all logic and output stages; must be low-impedance connection to minimize switching noise. |
| 24 | VCC | Positive supply rail - Requires local 0.1 µF ceramic decoupling adjacent to pin to suppress high-frequency supply transients. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 3-state enables | OEAB and OEBA allow asymmetric bus control - e.g., A→B active while B→A disabled - enabling half-duplex arbitration without external logic. |
| High-drive BiCMOS outputs | –32 mA/64 mA drive capability sustains signal integrity across 15-cm PCB traces loaded with 10 pF per node, eliminating need for buffer fanout. |
| Power-rail insensitive high-Z | Guaranteed high-impedance state below 2.1 V VCC eliminates bus glitches during hot-swap or partial power sequencing in modular systems. |
| TTL-compatible input thresholds | VIL ≤ 0.8 V and VIH ≥ 2.0 V ensure interoperability with legacy 74LS, 74ALS, and microcontroller GPIOs without pull-up/down resistors. |
| Robust latch-up immunity | Exceeds 500 mA per JESD-17 - prevents destructive latch-up during transient overvoltage events on bus lines or supply rails. |
Applications
| Industrial Backplane Interface | Legacy Microprocessor Bus Extension |
|---|---|
|
Use Scenario: Isolating CPU address/data bus from peripheral expansion slots in programmable logic controllers (PLCs). IC Role / Device Role / Timing Role: Bidirectional transceiver managing A-bus (CPU side) and B-bus (slot side); OEAB and OEBA synchronized to WR/RD strobes for cycle-accurate direction control. Use Value: Eliminates need for discrete direction-control logic and reduces slot interface latency by 3.5 ns versus 74ACT245-based designs. |
Use Scenario: Extending Z80 or 8086 data bus to external memory banks in retro-computing or test equipment. IC Role / Device Role / Timing Role: Noninverting transceiver providing 10-bit data path between CPU D0–D9 and memory D0–D9; OE signals driven by address decoder outputs. Use Value: Maintains TTL-level timing margins with tPHL ≤ 4.9 ns, enabling reliable 8-MHz bus operation without wait states. |
| Modular I/O Subsystem | Fieldbus Node Data Multiplexing |
|
Use Scenario: Interfacing isolated analog/digital I/O modules to a central controller via shared serial bus infrastructure. IC Role / Device Role / Timing Role: Bus isolator enabling hot-swap-safe module insertion; high-Z during VCC ramp prevents backfeeding into powered modules. Use Value: Enables safe live insertion of I/O modules without disrupting controller operation or requiring system reset. |
Use Scenario: Multiplexing sensor data from multiple RS-485 nodes onto a single CAN or Modbus RTU master port. IC Role / Device Role / Timing Role: Direction-controlled data bridge between isolated fieldbus transceivers and microcontroller UART peripherals. Use Value: Reduces component count by replacing two unidirectional buffers with one bidirectional device, saving 22 mm² PCB area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 10-bit bidirectional transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT245DW | 8-bit, single-direction-enable (OE only), identical VCC/drive/timing specs. | Requires external logic to manage bidirectional flow; not suitable for A↔B arbitration without added gates. | Select when only 8-bit width is needed and direction control is centralized - reduces cost by 18% but increases design complexity. |
| SN74LVC8T245PW | 8-bit, dual-supply (1.65–5.5 V), lower drive (–24/24 mA), 3.3-V optimized. | Supports mixed-voltage domains (e.g., 3.3-V MCU ↔ 5-V peripheral), but lacks 5-V tolerance on B-side inputs. | Select for modern low-voltage systems where voltage translation is required; not drop-in for pure 5-V SN74ABT861 replacement. |
Compared with SN74ABT245DW and SN74LVC8T245PW, the SN74ABT861 uniquely provides native 10-bit width and independent dual-OE control in a single 5-V device - critical for legacy industrial backplanes where bit-width and timing determinism cannot be compromised.
Availability
SN74ABT861 is available at Aetrix Electronics and suitable for industrial automation, retro-computing restoration, PLC backplane design, and legacy bus extension requiring stable component supply and long-term obsolescence management.
Supply support for SN74ABT861 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The ABT logic family - including SN74ABT861 - was engineered for high-speed, high-drive 5-V TTL-compatible systems requiring robust noise immunity, bus contention prevention, and seamless integration with legacy microprocessors and FPGAs.
FAQ
What is the maximum operating temperature range for SN74ABT861?
The SN74ABT861 is characterized for operation from –40°C to +85°C. This commercial-grade temperature specification applies specifically to the SN74ABT861 variant (as opposed to the military-grade SN54ABT861, rated –55°C to 125°C). The device maintains full electrical performance across this range, including guaranteed output drive and propagation delay limits, making it suitable for enclosed industrial enclosures and non-automotive embedded environments.
Does SN74ABT861 support hot-swap or live-insertion scenarios?
Yes, the SN74ABT861 supports hot-swap operation due to its guaranteed high-impedance state when VCC is below 2.1 V. During power-up or partial power loss, the outputs remain in high-Z, preventing bus contention or back-driving of powered subsystems. For robustness above 2.1 V, TI recommends tying OEAB and OEBA to VCC via pullup resistors - a practice confirmed in the SN74ABT861 datasheet to ensure deterministic disable behavior during intermediate supply states.
Can SN74ABT861 replace SN74ABT245 in an existing design?
No - SN74ABT861 cannot directly replace SN74ABT245 because it has 10 data bits and dual independent output-enable inputs (OEAB and OEBA), whereas SN74ABT245 is an 8-bit transceiver with only one OE input. While both share ABT-family drive strength and timing, the SN74ABT861's pinout, bit count, and control logic are incompatible. Replacing SN74ABT245 with SN74ABT861 would require PCB redesign and firmware updates to manage the additional two bits and dual-OE signaling.
What is the recommended decoupling for SN74ABT861 in high-speed applications?
Texas Instruments specifies a minimum 0.1 µF ceramic capacitor placed as close as possible to the VCC (pin 24) and GND (pin 12) of the SN74ABT861. For systems with heavy switching activity across all 10 bits, adding a second 4.7 µF tantalum or polymer capacitor within 10 mm further stabilizes the local supply. This decoupling strategy suppresses simultaneous switching noise (SSN) and ensures tPLH/tPHL remains within the 5.3 ns max limit under load - a requirement verified in the SN74ABT861 characterization report.
Is SN74ABT861 RoHS compliant and lead-free?
Yes, the SN74ABT861DW is RoHS compliant and features NiPdAu (NIPDAU) lead finish, as documented in TI's official packaging addendum. It meets JEDEC Level-1 moisture sensitivity rating with unlimited floor life at ≤30°C/60% RH, and is qualified for peak reflow temperatures up to 260°C. The part marking "ABT861" on the SOIC body confirms full compliance - no exemptions or alternate finishes apply to the standard SN74ABT861DW ordering code.
SN74ABT861DW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- Transceiver, Non-Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 10
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 32mA, 64mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SOIC
SN74ABT861DW FAQ
1.How can I place an order for SN74ABT861DW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT861DW on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SN74ABT861DW reliable?
The price and inventory of SN74ABT861DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT861DW is usually 5 days.
3.What payment methods are accepted for SN74ABT861DW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ABT861DW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ABT861DW?
SN74ABT861DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT861DW order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SN74ABT861DW?
For technical support, including SN74ABT861DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT861DW requirements.
6.How does Aetrix verify that SN74ABT861DW is sourced from the original manufacturer or authorized distributors?
All SN74ABT861DW products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SN74ABT861DW meets industry standards.
7.What is the process for return or replacement of SN74ABT861DW?
All SN74ABT861DW units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT861DW, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SN74ABT861DW part is unused and in its original packaging.
Return procedure for SN74ABT861DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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